ICEM IGES Translator. Reference Manual. April 2004

Transcription

1 ICEM IGES Translator Reference Manual April 2004 ICEM Ltd. 2004

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4 Contents Contents List of Tables Introduction Translating from IGES to ICEM Processing IGES Information Translating the IGES Drawing Entity Translating Units of Measure Translating Drafting Entities Tolerances Mapping IGES Entities to ICEM Entities Translating from ICEM to IGES Processing DDN PART Information DDN PART Release Revision Level Generating Header Information in the IGES File Translating ICEM Part Instances Translating ICEM View Layouts Translating Dormant Entities ICEM Symbols Mapping ICEM Entities to IGES Entities Executing the IGES Translator IGES Translator and License File Executing ICEM IGES ICEM IGES Command and Program Names Multiple Translation Sessions ICEM IGES Command Parameters Executing the Preprocessor (ICEM to IGES) Executing the Postprocessor (IGES to ICEM) Useful Steps before and after a Translation Useful Steps for Executing the Preprocessor (ICEM to IGES) Useful Steps for Executing the Postprocessor (IGES to ICEM) Translator Execution with Shell Scripts

5 Contents 5 IGES Directives Format of Directives Dependent Entities and Directive Control Selectable Verbs Selectable Objects Selectable Parameters Selectable Subsets Directive Descriptions $$ Directive *AV Directive *BEGINAND Directive *CONVERT Directive *CONVERT, CHARACTER Directive *CONVERT Directive File Examples: IGES %% Characters *CONVERT, CHARACTER=PROPORTIONAL Directive *CONVERT, NAME Directive *CONVERT Directives Relating to NURBS (B-spline) Geometry *CONVERT, WILSON_FOWLER_SPLINE Directive *CONVERT, ASSOCIATIVITY Directive *CONVERT,COMPOSITE_CURVE Directive *CONVERT,COPIOUS_DATA_FORM_123 Directive *DEBUG Directive *DEFINE Directive *DEFINE,LEVEL Directive *DEFINE,CHANGE_TO_WORLD_UNITS Directive *DEFINE,TOLERANCE and *DEFINE,LOOP_TOLERANCE Directives *DEFINE,IGES_TRIMMED_SURFACES Directive *DEFINE,UNIT_TRIM_REV Directive *DEFINE Directive Options for Postprocessing NURBS Geometry *DEFINE Values Created on ASCII Part File as Part Variables *DS Directive *ENDAND Directive *ENDSTS Directive *EXCLUDE (*SKIP) Directive *IDENTIFY Directive *INCLUDE (*SELECT) Directive *SCALE Directive *SELECT (*INCLUDE) Directive *SETSTS Directive

6 Contents *SKIP (*EXCLUDE) Directive Translator Output Error Messages Directive Errors Directive Error and Warning Messages Extended Entity Mapping Tables Transfer from IGES to ICEM ASCII Part Transfer from IGES to ICEM Surf DB Transfer from ICEM ASCII Part to IGES Transfer from ICEM Surf DB to IGES Glossary Index

7 List of Tables List of Tables Table 1 IGES Entities Translated to ICEM Table 2 ICEM Entities Translated to IGES Table 3 Error Codes for Batch Processing Table 4 Selectable Verbs Table 5 Selectable Objects Table 6 Selectable Subsets Table 7 B2 (IGES) Subset Table 8 G1 (IGES) subset Table 9 G2 (IGES) Subset Table 10 G3 (IGES) Subset Table 11 B2 (ICEM) Subset Table 12 G1 (ICEM) Subset Table 13 G2 (ICEM) Subset Table 14 G3 (ICEM) Subset Table 15 Error, Information, and Warning Messages (Sorted by Error ID) Table 16 Directive Error Messages Table 17 Directive Warning Messages

8 1 Introduction 1 Introduction The Initial Graphics Exchange Specification (IGES) establishes national, industry-wide standards for the exchange of computer-aided design/computer-aided manufacturing (CAD/CAM) graphics data. These specifications are maintained by the U.S. Product Data Association for ANSI, and are established by the computer industry. The purpose of IGES is to transfer product definition data (such as drawings) between different CAD/CAM systems. IGES specifies a file structure format, language format, and means for representing geometrical, topological, and nongeometric product data in these formats. The specification defines a system-independent format with standardized features and protocols for data exchange. The fundamental unit of information in the file is an entity. An IGES file treats the product definition as a collection of entities. Each IGES entity is represented in a neutral format, and corresponds to the same entity in the native format of the source CAD/CAM system. An entity can be geometric or nongeometric: Geometric entities represent the definition of the physical shape of the object. They include points, curves, surfaces, and relations (collections of similarly structured entities). Nongeometric entities include the viewing perspective for the drawing notes, dimensions, properties (for example, color), and groupings of entities. The standard assigns a type number to each type of entity. Some entity types include a form number for subclassifications. The VDA/VDMA have defined IGES subsets (VDAIS), in order to be able to conduct CAD data exchange of 2-D and 3-D geometry and dimensioning in a simple way without losses. In addition, subsets are defined to exchange free form geometry and trimmed surfaces on the base of B-splines. The U.S. CALS (Computer-aided Acquisition and Logistic Support) standard based on the MIL-D definitions divides IGES entity types into classes. 8

9 2 Translating from IGES to ICEM 2 Translating from IGES to ICEM The IGES postprocessor translates IGES data into DDN PART data. The IGES postprocessor reads version 3.0, 4.0, and 5.0/5.1/5.2/5.3 IGES files. 2.1 Processing IGES Information IGES files consist of three sections that contain information of major importance to the IGES postprocessor: 1. IGES Global Section contains system information associated with the IGES file, such as the name of the sending system, the date and time of creation, the real number precision used by the sending system, and so forth. The following global section information is passed to the DDN PART data: File processing control information (parameter and record delimiters) Units (inches, millimeters) File name (maps to the ICEM part name) 2. IGES Directory Entry Section has an index and attribute information for the IGES file. The following information is passed to the DDN PART data: Line font (solid, dashed, phantom, centerline). Other fonts are mapped to solid. Level (If there is a reference to property entity type 406, form 1, only the first of possibly many level numbers is used. This is because any DDN entity can be on only one level.) View (single, all, or selected views). Transformation matrix (forms 0 and 1 only). Entity status (blank; subordinate entity switch; hierarchy 406, form 10 not supported). Line color (colors 0-8; colors greater than 8 are mapped to color 0). 3. IGES Parameter Section contains the parameter data associated with an entity. When translating IGES entities into ICEM entities, the IGES postprocessor maps the parameter data to the appropriate DDN PART information Translating the IGES Drawing Entity IGES drawings are translated to ICEM view layouts. View layouts are assigned names derived from the IGES property entity 406 form 15. When this property does not exist in the IGES file, view layouts are assigned names of the form IGES DRAWINGxx, where xx is a drawing number. The IGES property entities 406 form 16 and form 17 determines the drawing size or the drawing units, respectively. An IGES drawing entity can specify the annotation that appears on the drawing. (Up to 10 views can be created for this purpose.) When translating the drawing entity, the IGES postprocessor creates a view in which the entities appear. All other IGES entities are blanked from these special drawing views. 9

10 2.1.2 Translating Units of Measure NOTE If you create new geometry using ICEM for the resulting DDN PART data, it shows up in the views created for the drawing annotation. If new unwanted entities appear in the annotated view of the drawing, you may need to blank them individually Translating Units of Measure The IGES postprocessor supports units of measure in inches and millimeters only. IGES standards packages from other sources may create parts in other units of measure, such as feet or centimeters. If the IGES postprocessor encounters an IGES file having a metric unit of measure, it generates the DDN PART data using millimeters as the unit of measure. If the IGES file uses an English unit of measure, the postprocessor generates the DDN PART data using inches as the unit of measure. If the units of the original IGES file are neither in inches nor millimeters, you will have to resize the part after reading the DDN PART data into ICEM Translating Drafting Entities ICEM has two drafting standards (ANSI and DIN) which will be set by the IGES translator. The execution parameter "ds" controls the setting; the default setting is ANSI (ds=a). When ANSI drafting standard is requested, the translator will map the IGES drafting entities into typical ICEM DDN drafting entities. If no mapping is possible, the drafting entities will be represented as "drafting groups" in the ICEM part. With DIN drafting specified, the translator will map all IGES drafting entities into ICEM drafting groups. ICEM DDN has a drafting modal that enables DDN to convert drafting groups into typical ICEM drafting entities. The modal is currently under the DDN menu "F ", and the part must be stored in order to initiate the conversion Tolerances The ICEM IGES postprocessor uses the parameter 19 of the IGES Global Section (minimum user-intended resolution, same point tolerance) to check coincidence of segment boundaries of B-spline curves and surfaces. If the gap between segments is larger than this parameter, a warning will be issued, but the entity is transmitted. Also refer to the *DEFINE,TOLERANCE directive later in this manual. 2.2 Mapping IGES Entities to ICEM Entities Table 2-1 shows the default translation mapping of the postprocessor. Use of the directive control feature may alter what entities are translated and what the resulting entities are. This conversion table may change if the DIN drafting standard is used. Table 1 IGES Entities Translated to ICEM Type IGES Entity Type ICEM Entity 0 Null entity Ignored 100 Circular arc 3 Circle 10

11 2.2 Mapping IGES Entities to ICEM Entities Type IGES Entity Type ICEM Entity 102 Composite curve Point Line Circular arc Conic arc Parametric spline: - Forms 4, 5 (2-D) - Forms 4, 5 (3-D) - Forms 1, 2, 3, 6 Rational B-spline Connect point Composite curve Not supported, but translated as an independent point Line Circle Conic Rotated cubic spline 3-D spline 3-D spline NURBS curve Not supported 104 Conic arc Derived from data Parent was an ellipse Parent was a hyperbola Parent was a parabola 4 Conic (1) 106 Copious data Forms: Data points Linear path 20, 21 - Centerline 31 - section lines 32-36, 38 section lines 37 - section lines 40 - Witness line 63 - Simple closed planar curve Point (default) Machining curve (directive option) Machining curve Centerline Sectioning, material iron ", user-defined material ", material lead Group, special form 34 Machining curve 108 Plane (2) 0 - Unbounded plane +1 - Bounded plane -1 - Hole in plane Bounded planes are translated into trimmed surfaces (type 27) if referenced by a single parent associativity (type 402/9). The parent entity has to be a bounded plane (form +1). 18 Plane Trimmed surface Plane (unbounded) 110 Line 2 Line 112 Parametric spline Forms: 1 - Linear 2 - Quadratic 3 - Cubic 4 - Wilson-Fowler (2-D) 4 - Wilson-Fowler (3-D) 5 - Modified Wilson-Fowler (2-D) 5 - Modified Wilson-Fowler (3-D) 6 - B-spline D spline 3-D spline 3-D spline Rotated cubic spline 3-D spline Rotated cubic spline 3-D spline 3-D spline 114 Parametric spline surface 26 Maps to one or more NURBS surfaces. 116 Point 1 Point 11

12 2.2 Mapping IGES Entities to ICEM Entities Type IGES Entity Type ICEM Entity 118 Ruled surface Point Line Circular arc Conic arc 120 Surface of revolution Line Circular arc Conic arc Parametric spline Composite curve Rational B-spline Any curve entity to which a parametrization has been assigned. 122 Tabulated cylinder Line Circular arc Conic arc Parametric spline Composite curve Rational B-spline Ruled/developable surface Point Line Circle Conic Surface of revolution Line Circle Conic Rotated cubic spline or 3-D spline Composite curve NURBS curve Limited to supported curves in this table Tabulated cylinder or Ruled surface, form 3 (10) Line Circle Conic Rotated cubic spline or 3-D spline Composite curve NURBS curve 123 Direction Not supported 124 Transformation matrix Form 0, right-handed matrix Form 1, left-handed matrix Forms 10, 11, 12 TABLE 4 matrices (3) To right-handed matrix. To right-handed matrix. Both the referenced data and matrix are restated into the right-handed system. Not supported 125 Flash Not supported 126 Rational B-spline curve 31 NURBS curve 128 Rational B-spline surface 26 NURBS surface 130 Offset curve Not supported 132 Connect point Not supported 134 Node Not supported 136 Finite element Not supported 138 Nodal displacement and rotation Not supported 140 Offset surface 28 Offset surface 141 Boundary 55 Loop 142 Curve on parametric surface 55 Loop 143 Bounded surface 27 Trimmed surface 144 Trimmed surface 27 Trimmed surface 146 Nodal results Not supported 12

13 2.2 Mapping IGES Entities to ICEM Entities Type IGES Entity Type ICEM Entity 148 Element results Not supported 150 Block Not supported 152 Right angular wedge Not supported 154 Right circular cylinder Not supported 156 Right circular cone frustum Not supported 158 Sphere Not supported 160 Torus Not supported 162 Solid of revolution Not supported 164 Solid of linear extrusion Not supported 168 Ellipsoid Not supported 180 Boolean tree Not supported 182 Selected component (CSG) Not supported 184 Solid assembly Not supported 186 Manifold solid B-rep Not supported 190 Plane surface Not supported 192 Right circular cylindrical surface Not supported 194 Right circular conical surface Not supported 196 Spherical surface Not supported 198 Toroidal surface Not supported 202 Angular dimension (4) Angular dimension Standard angular dimension, form 1, Shouldered angular dimension, form 2 or Group, special form Curve dimension Not supported 206 Diameter dimension (4) Diameter dimension Standard diameter dimension, form 0, Shouldered diameter dimension, form 1 or Group, special form Flag note 15 Group, special form General label 15 Group, special form General note (4) Fonts 1, 1001, 1002, 1003 Font 0 and all others General note Standard note or Group, special form 32 Supported Converted to font New General note Not supported 13

14 2.2 Mapping IGES Entities to ICEM Entities Type IGES Entity Type ICEM Entity 214 Leader (arrow) 15 Group, special form Linear dimension (4) Linear dimension Standard linear dimension for horizontal and vertical orientations, form 0 or Group, special form Ordinate dimension 15 Group, special form Point dimension 15 Group, special form Radius dimension (4) Radius dimension Standard radius dimension, form 0 or Group, special form General symbol 15 Group, special form Sectioned area 39 Section lining (5) 302 Associativity definition Not supported 304 Line font definition Not supported 306 MACRO definition Not supported 308 Subfigure definition Supported (6) 310 Text font definition Not supported 312 Text display template Not supported 314 Color definition Not supported 316 Units data Not supported 320 Network subfigure definition Supported (6) 322 Attribute table definition Not supported 402 Associativity instance (9) Forms: 1, 7, 14, 15 - Group 3 - Views visible 4 - Views visible, color, line weight 9 - Single parent associativity 13 - Dimensioned geometry 16 - Planar associativity 15/44 15/44 15/44 15/44 Standard group, form 1, or set Supported for selective view blanking. Supported for selective view blanking. Color, line font, and weight ignored. For planes: see plane entity For any other entity: standard group, form 1, or set Standard group, form 1, or set Standard group, form 1, or set 404 Drawing 50 Systems view layout, form 2 (7) 14

15 2.2 Mapping IGES Entities to ICEM Entities Type IGES Entity Type ICEM Entity 406 Property Forms: 1 - Definition levels 15 - Name 16 - Drawing size 17 - Drawing units Not supported, with noted exceptions: Level for DDN entities translated from any IGES entity with this property. (Only first level number is used.) Layout name (maximum of 32 characters) Layout size (restated for units) Layout unit (if layout unit of measure differs from the part's unit of measure, annotation is restated. Unit strings that describe the part's unit of measure are honored.) 408 Singular subfigure instance All orientation and scaling is honored. (6) 410 View TABLE 4 views (8) 412 Rectangular array subfigure instance 12 Rectangular array subfigure 414 Circular array subfigure instance 13 Circular array 416 External reference Not supported 418 Nodal load/constraint Not supported 420 Network subfigure instance All orientation and scaling is honored. (6) 422 Attribute table instance Not supported 430 Solid instance Not supported 502 Vertex Not supported 504 Edge Not supported 508 Loop Not supported 510 Face Not supported 514 Shell Not supported User-specified MACRO instance User-specified MACRO instance Not supported Not supported NOTE 1. The entity is reviewed and classified into one of the following forms: ellipse, hyberbola, or parabola, or the entity is rejected in accordance with recommended practice. Note that the former parent status is ignored. 2. The clipping planes of an IGES drawing entity are not translated to planes in the DDN PART data. However, they are used to formulate the DDN PART view layout entity. 3. Use in the IGES file determines final translator usage. For example, if the matrix describes an orientation of an IGES entity that maps to an ICEM model space entity, the IGES entity is restated to eliminate the matrix. IGES planar entities (conics, for example) may be restated to reduce the number of matrices that are needed to describe the entities. A maximum of matrices can be passed to ICEM. 15

16 2.2 Mapping IGES Entities to ICEM Entities 4. To maximize the number of IGES dimensions converted to functional dimensions, the IGES arrowheads should have a length to width ratio of three to one. Any text string character count should also not exceed 249 characters. Text lines should have uniform downspace at the beginning of each line. Most CAD/CAM systems and their IGES preprocessors should be able to write IGES files that conform to these specifications. 5. When translating an ICEM section lining generated from an IGES entity type 230 back into IGES again, this part must first be stored through ICEM. This updates copious data to display sectioning. Materials not known in ICEM will be mapped to iron. 6. ICEM IGES supports an absolute maximum of 64 subfigure levels. Each level may contain many subfigure instances, each with its own relative level count. The Network Subfigure is translated as a regular Singular Subfigure. (Connect Point entity references are ignored and there is no independent-axis scaling.) 7. ICEM IGES supports up to 10 IGES drawings with directly associated annotation data within an IGES file. No limit is set for the number of drawings supported without annotation. At most, 80 views are allowed to compose a layout. View count is limited to the TABLE 4 restrictions described in note 8. All IGES drawing entity annotation data is mapped to one of the views 9 through 19 initially reserved for one of the first 10 drawings with annotation. The IGES standard indicates only positive drawing-coordinates are allowed. If a layout is indicated as translated, it may be necessary to stretch the view borders while maintaining view origin placement and without resizing the layout. 8. A maximum of 420 views can be passed to ICEM including those created to support annotation for IGES drawings. If a view is referenced by an IGES drawing entity and has no associated clipping planes, the view is assigned a set of clipping planes. 9. If a group has more subentities than DDN allows (currently 240), the group is divided into several independent groups. 10.If a tabulated cylinder is the underlying surface of a trimmed surface, the tabulated cylinder will be translated to a ruled surface, form 3 which will subsequently be translated in DDN into a ruled surface, form 1. This is to ensure the uv-space parameters of the surface fall into a range of 0.0 to

17 3 Translating from ICEM to IGES 3 Translating from ICEM to IGES The IGES preprocessor translates DDN PART data to an IGES file. The IGES preprocessor writes ANSI version 5.3 IGES files. 3.1 Processing DDN PART Information During translation, entities are processed sequentially from the beginning to the end of the file, except for the following entity types: groups, composite curves, associativities, and annotations. For these entity types, the parent entity is translated before the subentities are translated. Only DDN Parts in ASCII format are translated. It may be necessary to convert the binary format part into ASCII using ICEM DDN. 3.2 DDN PART Release Revision Level Each specific version of the IGES preprocessor is able to translate DDN Parts of the same version. The version of the translator is indicated in the product identifier and on the translation list file. To guarantee proper translation, the DDN Part release revision level and the translator version should match. If a preprocessor cannot translate a DDN Part due to a version difference, the translation is not started and a message is output onto the translation list file. The user is requested either to use the proper translator version or to update the part to the proper version using ICEM DDN. 3.3 Generating Header Information in the IGES File The IGES definition requires information such as part name and generation date of the IGES file being written into the IGES file (Global Section). But it may be necessary to pass more information such as: number and generation date of part name of company and department name and telephone number of designer, and so forth as a Header (transmission header). This kind of information can be written in rather free form into the IGES file Start Section. ICEM IGES allows several ways (which can be combined) to write header information into the IGES file start section: H-parameter of preprocessor (argument is a file name) Block within *SETSTS-/ *ENDSTS directive (set start section) File name parameter of *SETSTS directive When applying several of the ways above, the order of the information inserted into the start section will be the following: 1. Information from the file specified by the H-parameter 17

18 3.4 Translating ICEM Part Instances 2. Information from the block within the *SETSTS/ *ENDSTS directive 3. Information supplied by the file defined by the *SETSTS directive. Some institutions, like the VDA, have defined a suggested (standardized) form of the header, in this case called VDAIS header, to be used by their members. Before executing the ICEM IGES preprocessor, the header, as a file, has to be completed (that is, using an editor). The first line of the VDAIS header "VDAIS VERSION/LEIST:" (VDAIS Version/Performance Level) will be completed by ICEM IGES, when the appropriate subset is selected by a directive (see *SELECT,SUB directive). If this line does not exist in the header file, ICEM IGES will automatically insert such a line into the IGES file start section, when the appropriate directive(s) is/are included in the directive file. Below, the VDAIS header is listed: ************************************************************************ VDAIS VERSION/LEIST: SENDER DETAILS SENDING FIRM : CONTACT PERSON : -TELEPHONE : -ADDRESS : GENERATING SYSTEM : GENERATION DATE : SENDING FILENAME : PART DETAILS PROJECT : OBJECT TITLE : VARIANT : CONFIDENTIALITY : VALID FROM (DATE) : RECEIVER DETAILS RECEIVING FIRM : RECEIVER NAME/DEPT.: ************************************************************************ 3.4 Translating ICEM Part Instances When preparing an ICEM part that contains part instance or local instance entities for the IGES translation, this part should be "unlinked" using DDN to obtain a complete part for the translation. The unlink feature in DDN resolves all instances (references) to other parts/masters and merges them into the part to be translated. It may be necessary to do the unlink with a copy of the original part in order to save the structure of instancing. 18

19 3.5 Translating ICEM View Layouts 3.5 Translating ICEM View Layouts When translating a part from ICEM, the IGES preprocessor translates only the last view layout used. The IGES preprocessor lists the name of the translated layout. If you wish another view layout to be translated, you must enter ICEM DDN, display the desired layout and store the part. See also further notes at the end of this chapter about this entity. 3.6 Translating Dormant Entities Deleted entities that were used to construct an entity are retained in the ICEM data base as dormant entities, which are inaccessible. When a part is unblanked during translation, previously deleted entities may reappear in the translated files. If this happens, the unwanted entities must be deleted again. 3.7 ICEM Symbols The IGES preprocessor maps ICEM symbols to the appropriate IGES symbols. ICEM symbols with no IGES counterpart are translated as blanks. The following ICEM symbols are not supported: Conical taper Flat taper 3.8 Mapping ICEM Entities to IGES Entities The table below shows the default translation mapping of the preprocessor. Use of the directive feature may materially alter what entities are translated and what the resulting entities are. Table 2 ICEM Entities Translated to IGES Type ICEM Entity Type IGES Entity 1 Point 116 Point 2 Line 110 Line 3 Circle 100 Circular arc 4 Conic Forms: 1 - Offset conic 2 - Ellipse 3 - Parabola 4 - Hyperbola Detail magnified: 8 - Offset conic 9 - Ellipse 10 - Parabola 11 - Hyperbola 104 Not supported Ellipse Parabola Hyperbola Not supported 19

20 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity 5 Rotated cubic spline (also called 2-D or Wilson-Fowler spline) Forms: 1-2-D spline 2 - Offset 2-D spline 2 - Trimmed offset 2-D spline 10 - Nonregenerative 2-D spline 3 - Detail magnify Parametric spline curve, form 4 Parametric spline curve, form 4 Not supported; convert entity to 2-D spline (or 3-D spline or B-spline curve) first using ICEM DDN. Parametric spline curve, form 4 Not supported 6 Composite curve Form 1 - general composite curve Subcurves: Line Arc ConicRotated cubic spline 3-D spline 102 Composite curve Subcurves: Line Arc Conic Parametric spline curve Parametric spline curve 7 Vector 102 Composite curve, consisting of 6 lines (IGES entity type 110) 8 Point set If a member of a drafting group (6) If not a member of a drafting group Associativity, form 7, consisting of lines (IGES entity type 110) Composite curve, consisting of lines (IGES entity type 110) 9 3-D spline 112 Parametric spline curve, form 3 10 Machining curve 106 The supporting type 14 entities are translated as: Copious data, forms 11, 12, 13 (form 13 excluded if curve used for surface definition) 11 String Subentities: Lines Arcs 12 Rectangular array Base entities: Group Point Line Arc Array 13 Circular array Base entities: Group Point Line Arc Array 102 Composite curve Subentities: Lines Arcs 412 Rectangular array subfigure instance If the base entity has been translated, it is used. It must be processed prior to processing IGES entity type Circular array subfigure instance If the base entity has been translated, it is used. It must be processed prior to processing IGES entity type

21 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity 14 Copious data Forms: 0 - Standard 1 - N/C toolpath copious 2 - N/C tool image copious 3 or 4 - B-spline control points 9 - Drafting copious data 106 Copious data, specific form depends on use. Not supported Not supported Translated along with type 26 or 31 entities. Not applicable 15 Group (4) Forms: 1-Standard 15 Group (4) Forms: Balloon (ANSI only) (equivalent to type 72) 3-Surface texture symbol (equivalent to type 73) 4-Datum target (ANSI only) (equivalent to type 74) 5-Polyline (equivalent to type 77) 6-Welding symbol (equivalent to type 78) 7-Drafting leader (equivalent to type 79) 8-Cutting plane line (equivalent to type 80) 22-Trimmed linear dimension (equivalent to type 62) 30-Feature frame (equivalent to type 70) Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Linear dimension (trimming of dimension lines not captured; trimming of witness lines is captured) Associativity, form 7, plus the component entities General note Leader (arrow) Witness line General label Angular dimension Diameter dimension Flag note Linear dimension Ordinate dimension Point dimension Radius dimension General symbol 16 Variable tables Not supported 17 Surface curve The underlying curve referenced by an ICEM Type 17 entity is translated to a support curve for an IGES type 142 (curve on parametric surface) or 141 (boundary). 18 Plane Plane, form 1 Copious data, form 12 21

22 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity 19 Surface of revolution Base curves: Any valid single curve Line to define the axis of rotation Surface of revolution Any curve listed as translating in this table. 20 Tabulated cylinder Base curves: Any valid single curve 21 Ruled/developable surface Base curves: Any valid single curve or point 122 Tabulated cylinder Any curve listed as translating in this table. 118 Ruled surface (3) Any curve listed as translating in this table. One of the two base curves can be a point. 22 Curve mesh surface Not supported; convert entity to a NURBS surface first, using ICEM. 23 Fillet surface Not supported; convert entity to a NURBS surface first, using ICEM. 25 Surface curve surface The underlying surface referenced by an ICEM Type 25 entity is translated to the surface that is trimmed (bounded) by an IGES type 144 (trimmed surface) or 143 (bounded surface). See ICEM Type NURBS surface Subtypes: Bi-cubic nonrational All forms Parametric spline surface (directive option) Rational B-spline surface 27 Trimmed surface Trimmed surface (default) or Bounded surface (directive option) 28 Offset surface 140 Offset surface 29 Composite surface Component surfaces are translated; you can convert entity to a NURBS surface using ICEM. 30 Curve-driven surface Not supported; convert entity to a NURBS surface first, using ICEM. 31 NURBS curve Cubic nonrational (directive option) All forms 32 Linear dimension Forms: 0 - Standard linear dimension 2 - ANSI rectangular coordinate dimension 2 - DIN coordinate dimension Parametric spline curve Rational B-spline curve Linear dimension Linear dimension Ordinate dimension 33 Radius dimension 222 Radius dimension 34 Label/taper/chamfer dimension Forms: 0, 1- Standard label 3 - Conical taper dimension 4 - Flat taper dimension 5 - Chamfer dimension General label Not supported Not supported General label 22

23 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity 35 Diameter dimension 206 Diameter dimension 36 Angular dimension Forms: 0, 1 - Standard angular dimension 2 - Shouldered angular dimension 3 - Arc length dimension 4 - Shouldered arc length dimension 37 General note Forms: 1 - Standard note 2 - Note parallel to line 3 - Note parallel to arc Angular dimension Angular dimension Not supported Not supported General note General note Not supported 38 Centerline Forms: 1 - Through a set of points 2 - Through a set of arcs and bolt circles 3 - Detail magnified centerline 39 Section lining (1) Forms: Copious data, form 20 or 21 Not supported Not supported 106 Copious data Mapped to forms Special symbols (4) Forms: 0-Feature frame/reference symbol/balloon (DIN only) (feature frame is a subentity of a type 70 entity; reference symbol is equivalent to type 75; balloon is equivalent to type 72) 1-Feature frame (ANSI only) (subentity of a type 70 entity) 2-Datum feature (ANSI only) (equivalent to type 76) 3-Composite feature frame (ANSI only) (subentity of a type 70 entity) Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities Associativity, form 7, plus the component entities 41 Template Not supported 42 Part instance Not supported. Use the ICEM DDN unlink feature to merge instanced parts into the part to be translated. 43 Work axis Not supported 44 Set Associativity, form 7, plus the component entities 45 Systems GPG, inserts, and N/C modals Not supported 46 Toolpaths Not supported 47 Composite toolpath Not supported 48 Toolpath GPG Not supported 49 Tool Not supported 23

24 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity 50 Systems (2) All others Drawing View-view scale is determined from layout View clipping planes are derived from the layout (Z-clipping is ignored) Associativity Forms: 15 - User-defined layout name only is used 16 - Size is from layout 17 - Drawing unit of measure (same as DDN PART) Not supported 51 CSG node, B-Rep (Reference) Not supported 52 Primitives Not supported 55 Loop Curve on parametric surface or Boundary 58 Metacurve 102 Composite curve 60 Data point set Not supported 61 Data structure Not supported 62 Trimmed linear dimension (5) (equivalent to type 15, form 22) 70 Feature frame (5) (equivalent to type 15, form 30) 72 Balloon (5) equivalent to: type 15, form 2 (ANSI only) type 40, form 0 (DIN) 73 Surface texture symbol (5) (equivalent to type 15, form 3) 74 Datum target (5) (ANSI only) (equivalent to type 15, form 4) 75 Reference symbol (5) (DIN only) (equivalent to type 40, form 0) 76 Datum feature (5) (ANSI only) (equivalent to type 40, form 2) 77 Polyline (5) (equivalent to type 15, form 5) 78 Welding symbol (5) (equivalent to type 15, form 6) 79 Drafting leader (5) (equivalent to type 15, form 7) 80 Cutting plane line (5) (equivalent to type 15, form 8) 216 Linear dimension (trimming of dimension lines not captured; trimming of witness lines is captured) 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 402 Associativity, form 7, plus the component entities 24

25 3.5 Translating ICEM View Layouts Type ICEM Entity Type IGES Entity Local Instance Master Local Instance Not supported. Use the ICEM DDN unlink feature to merge local instances into the part to be translated. NOTE 1. The section lining entity is queried for form number only and then the supporting copious data is translated. 2. For a DDN PART having multiple view layouts, only the most recently defined layout is translated. When the format view is contained in the ICEM view layout (for example, the drawing frame around the views), it determines the physical size represented by IGES entity type 406 form 16. Otherwise, each view's lower left-hand and upper right-hand corners, as placed on the layout, are used to define the shape and size of the rectangle that encloses the IGES drawing. The view layout is like a paper sheet on which the drawing is composed. 3. The DDN part containing a ruled surface form 3 must be updated in ICEM and filed so that the ruled surface form 3 can be translated into a ruled surface form Entities with type 15, form 2-30, and some of the entities with type 40 on the ASCII part file will have a different entity type number within the ICEM DDN program. These entities are cross-referenced to their ICEM DDN entity type number where appropriate. 5. Entities with this type number within the ICEM DDN program will have a different entity type number on the ASCII part file. The equivalent ASCII part entity number is shown. 6. An entity is a member of a drafting group if it belongs to a type 15, form 2-30 group. 25

26 4 Executing the IGES Translator 4 Executing the IGES Translator 4.1 IGES Translator and License File An ASCII license file is provided to each customer and must be installed correctly before the ICEM IGES translator can execute. If the license file is not installed, cannot be accessed, or contains incorrect license information, the translator issues an error message to the translation list file and stops executing. The license file limits the number of simultaneous users of ICEM IGES (network licensing). The ICEM application installer will install the license file and set up an environment variable containing the path to it. This variable also describes the path to the commands (starting procedures) to execute ICEM IGES. The environment variable containing the path is named ICEM_ACN. Without variable ICEM_ACN, the ICEM IGES translator cannot find the license file. 4.2 Executing ICEM IGES ICEM IGES can be executed by typing in commands with parameters. The commands are executable procedures, which reside in directory trees together with the other ICEM applications. Each application has its own directory. Paths to these directories are to be established during installation. 4.3 ICEM IGES Command and Program Names The following are the standard UNIX names for IGES commands, executable procedures (script files) and programs being used in the ICEM IGES environment. The command for the IGES preprocessor (translation from ICEM to IGES) is iges_pre. The command for the IGES postprocessor (translation from IGES to ICEM) is iges_post. The commands reference executable procedures. Procedure iges_pre calls the preprocessor executable program igespre_exec, and procedure iges_post calls the postprocessor executable program igespost_exec. Upon request by the user, these names may be changed that is, to identify a new version independently from an installation process. In this case, it is the user's responsibility to define paths to the procedures and programs. Under such circumstances, it is possible to execute the translator programs (..._exec) directly as a command without the procedures. However, it is emphasized here that the procedures precheck parameters and delete scratch files. Procedures are not used for Windows platforms. The executable program names are entered directly. These names are iges_pre.exe and iges_post.exe. 4.4 Multiple Translation Sessions For ICEM IGES versions and earlier, if one translation run is executing in a directory, no other translation should be started there. The reason for this is that the translator used scratch data files in the current directory. 26